I love having huge numbers because I like to create masterworks. There is a link here. My current fort is built entirely around the magma forges - everything in it is an add-on to the magma forges I rushed to set up at the start. I have a legendary dwarf for each smithing profession: blacksmith, metalcrafter, weaponsmith, and armoursmith. And I have them making items on repeat with DFhack workflow. Anything not a masterwork gets fed to the furnaces and converted back into precious steel, platinum, silver, and gold, while everything else gets hauled someplace else to have gems or bones or whatever encrusted in it. About a quarter of the population is in the military. Another quarter are legendary craftsdwarves. The remaining half of the population are haulers and busy-bodies that do all the unskilled labour in the fort, and additionally spend their off-time making shit quality weapons and armour to be melted down so that when they mood they produce and become something useful.
Basically, in addition to farming and food making and carpentry and textiles and leatherworking and stonework, with a few workshops and about 4-8 dwarves each, there are a total of four dwarves dedicated to only metalworking, and five forges and ten furnaces that burn constantly. That means there are always 19 dwarves making or destroying metal items. And that's excluding all the hauling involved.
This fort has 80 dwarves; the pop cap I set. This is not enough for the level of industry I'm trying to sustain. Unfortunately, setting the popcap higher will probably send the measly FPS of 30 I currently have down to the HFS.